Speed control of a universal motor is achieved by__________?
Correct answer: E. all of the above methods
- A. varying field flux with tapped field windings
- B. connecting rheostat in series
- C. applying variable voltage by means of silicon controlled rectifier
- D. applying variable voltage by means of variable auto-transformer
- E. all of the above methods
Explanation
Universal-motor speed can be controlled by changing field flux, adding series resistance, or varying the applied voltage using an SCR or autotransformer. Therefore, all the listed methods are applicable.
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